Chemistry of inorganic compounds – Halogen or compound thereof – Chlorine dioxide
Patent
1996-02-23
1999-01-05
Woo, Jay H.
Chemistry of inorganic compounds
Halogen or compound thereof
Chlorine dioxide
95265, C01B 1102
Patent
active
058558616
ABSTRACT:
A method of forming an aqueous chlorine dioxide solution is disclosed which includes reacting in a reaction vessel an acid reaction solution containing a hydroxy carboxylic acid and a companion acid with an alkali metal salt of a chlorite ion. In accordance with the process, the hydroxy carboxylic acid serves to temporarily transfer chlorine from and does not form a salt with the alkali metal salt of a chlorite ion. The aqueous chlorine dioxide solution produced is substantially free of chlorous acid and preferably is free of other by-products such as sodium chloride and free chlorine. The method further includes maintaining the reaction vessel at a pH of less than 5 and/or withdrawing at least a portion of the chlorine dioxide from the aqueous chlorine dioxide solution. The method enables rapid, efficient, compact and safe generation of chlorine dioxide. A method of disinfecting water, and apparatus for making chlorine dioxide and for disinfecting water also are provided.
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Morrison Betsey J.
Water Technologies Limited
Woo Jay H.
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